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Service Manual – SW5500, FLOORTEC R 985
29 - Engine System, LPG
Functional Description
The engine system (Honda iGX 270) generates electric current for all machine functions
The assembly consists of an internal combustion engine and alternator, which are both connected to the
main crankshaft
The engine is a single-cylinder air-cooled LPG type
Engine starting is performed by a starter motor
The running engine supplies the power to generate the current and to power the electrical systems of the
machine The surplus current is used to charge the batteries
The engine speed is regulated from 2,300 to 3,000 rpm, on the basis of the load, and to provide constant
current to the electrical system
The LPG tank is fastened to the relevant holder in the rear side of the machine and connected to the power
supply system with a hose and a double solenoid valve
When turning the ignition key, the safety solenoid valve opens, the liquid gas passes through the filter in the
fuel solenoid valve, thus reaching the pressure reducer
The pressure reducer lowers the gas pressure, which then reaches the carburettor
The LPG system is protected against any overpressure by a relief valve which activates at 27 atm (400 PSI)
The fuel reserve icon is shown on the display when the sensor in the power supply system detects a pressure
lower than 1 1 bar (16 psi)
For safety reasons, if the engine is not started (ignition key to “II”) within 10 seconds after turning on the
Main Control Board (ignition key to “I”), the safety solenoid valve automatically closes the gas power supply
The engine is equipped with an oil level sensor (Oil Alert), which purpose is to avoid damages caused by an
insufficient oil quantity in the oil pan. Before the oil level goes below the safety limit, the system (Oil Alert)
automatically stops the engine by short circuiting the spark plug to the chassis
If the engine stops and do not restart, check the engine oil level before doing any other troubleshooting
procedure
The LPG solenoid valve is turned off by the Main Machine Controller (EB1) in the following three cases:
•
After 10 sec. that the motor is detected off (through the entrance that verifies the alternator voltage)
• If the Oil Alert system will indicate a lack of oil
•
If an excessive temperature is detected on the heat sink of the alternator rectifier bridge (ALT)
